Tool for smoothing wooden surfaces



April 12, 1932- G. STAEHLE TOOL FOR SMOOTHING WOODEN SURFACES Filed Oct.10, 1950 2, f. WI V 1 M 6. 77.

Patented Apr. 12, 1932 UNITED STATES P ENT, ori ice.

GUSTAV STAEI-ILE, F STUTTGART, GERMANY, Ass-xenon 'ro THE FIRM .CYKLOP'AK'I.

ass, or SCHAFFHAUSEN, SWITZERLAND g V J TOOL son SMOOTHING woonnnSURFACES Application filed October 10, 1930, Serial m5. isasssf'ana inGermany May 12, 1930.

In the case of the tool for smoothing woodon surfaces, which has becomeknown by rea son of my British Patent No. 264,699 the tools consist ofthin discs, which are assembled into a roll-like unit, and which areassembled on a rapidly revolving disc. The tool which is the subjectmatter of the present invention is another constructional form thereof.The present constructional form of the tool consists essentiallytherein, that the tool eXecutes a reciprocating motion instead of arotary movement. This allows it to be designed as a hand tool, and towork on surfaces which are otherwise rather diiiicult to work upon.

The reciprocating movements of the tool during working necessitates adifferent mounting and arrangement of the disc shaped circular knives orcutters. These cutters or knives are according to the present invention30 mounted on their spindles, on which they are assembled one behind theother, with or without play, so that they cant over during and owing tothe to and fro movement. They cant when moved forward to one s de andcant to the other side when moving backwards, and consequently eitherone or the other cutting edge cuts, and thus they are continuously keptsharp. They execute in cutting a rotary movement which may of course beeffected by a direct drive of the stationary inclined discs in such acase.

In place of the circular discs or in conjunction therewith it ispossible to use knives or cutters of a different contour, they may for85 instance be of a triangular shape, this shape or another similarsuitable contour enabling the knives or cutters to work very close tothe vertical wall abutting to the horizontal surfaces. The object of theinvent-ion is moreclearly explained in the drawings by means of aconstructional form given as an example.

Figures 1 and 2 show a bottom and a side view of the arrangement of theknife rolls as adapted to a reciprocating movement of the tool.

Figures 3 and 4: show thesknife or cutter rolls in side views, bothbefore the start and during working.

Figure 5 is a plan or top view of another constructional formof thecutter or knife discs. l

The tool itself is composed of'individual thinknife or cutting discs,which are assembled so as to form a rolllike unit.- They are arranged,one surface behind the other, loose and rotatable on the horizontalspindle b, and are-kept apart at the proper distance by means ofintermediate discs or Washers-0, play being allowed between all of them.

These knife, or cutter rolls or spindles arearranged on sockets orbrackets d, comprising a base which are moved to and fro, as shown byarrows in Figures 1 and 2, the movement being effected eithermechanically or manui6 ally. It is preferable to arrange the cutter orknife rolls so that they are oblique to the direction of movement, andin such a manner that the individual rolls are disposed at an angle toeach other. By meansof altering '10 the inclination as for instance bymeans of turningthem around the fixing bolt e serving as arota-tionalpivot, it is possible to vary and adjust the thickness of the shavingsi. e. the depth of thecut. The rolls may be positioned in relation toone another in any suitable manner.

According to the invention the knife or cutting discs a are mounted insuch a manner on their spindle b, that by reason of allowing suliicientplay, they automatically assume an oblique or inclined position as shownin Figure 4, and thus only work withone edge, which acts as a cutter.According to whether the tool is moved forwards or backwards, so '85 oneor he other of the two cutting edges is at work alternately and byreason of this, and i also by reason of the very great thinness of theknife or cutterblade, the edges are continuously kept sharp.

The cutter or knife discs (1 may have any suitable or desired contour.In Figure 5 a triangle disc with rounded off corners is shown,this shapeenabling the tool to smooth the surfaces right up to or nearly up to avertical wall, as indicated in Figure 5, provided the knives or rollsare mounted sufficirlmtly far outwards on the socket or bracket i i WhatI claim is e 1. A tool for smoothing Wooden surfaces comprising a base;and a plurality of cutter rolls angularly mounted on said base relativeto the direction of movement of the tool,

said rolls having cutters capable of assuming inclined position.

2. A tool for smoothing Wooden surfaces comprising a base; and aplurality of cutter rolls angularly mounted f on said base relative tothe direction of movement of the tool,

. each roll having a plurality of spaced discs mounted on a spindle sothat there is play between the discs to permit the discs to assumeinclined positions.

3. A tool for smoothing Wooden surfaces comprising-a base; and aplurality of cutter rolls angularly mounted onsaid base relative to thedirection of movement of the tool, each roll having a plurality ofspaced discs mounted on a spindle and each disc being of polygonal formor contour.

In testimony whereof I have hereunto V signed my name.

GUSTAV STAEHLE.

